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Mumrik
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Boeing 747-400 wing questions

Fri Jun 24, 2016 7:48 am

Hi,
I am looking at the wing dimensions on the 747-400 and see that the wingspan on the -400 is lager then the classics wingspan (211 ft 5 in (64.4 m) in comparison to 195 ft 8 in (59.6 m)), exept the 747-400D which has the same wingspan as the classics.
I have heard that it is possible to take of the winglet on the 747-400 and be left with the wingspan of the -400D, so is this true?
And what is then the advantages and disadvantages of these?
And what dimensions and weight specifications do the 747-400 winglet have?
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ADent
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Re: Boeing 747-400 wing questions

Fri Jun 24, 2016 8:54 am

Mumrik wrote:
I have heard that it is possible to take of the winglet on the 747-400 and be left with the wingspan of the -400D, so is this true?

Not sure if it is just the winglet, but you can convert to/from 747-400D. The latest one is the GE 747-400 test bed for the 777-9 engines. They pulled the winglet, wing extension bit off.

Mumrik wrote:
And what is then the advantages and disadvantages of these?

Winglet saves fuel on long flights. But it weighs more, so on short flights it costs fuel.

GE has already removed the standard winglets because these add unnecessary weight and a maintenance burden to the aircraft’s flight-test role. Later this year, the outer 6 ft. of each wingtip also will be removed, reducing the overall span to the 195-ft., 8-in. of the 747 Classic and effectively converting the aircraft into a -400D “domestic” variant. The -400D was a specially beefed-up variant of the -400 developed for the Japanese short-range market and did not feature the extended wingtips and winglets of the standard -400. Designers say the stiffer wing will reduce potential exposure to limit cycle oscillation and maintain an unrestricted test envelope.

Quote from another website, but I think originally from AvWk&ST
 
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747classic
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Re: Boeing 747-400 wing questions

Fri Jun 24, 2016 10:31 am

Two ANA 747-481 long haul aircraft were modified to the 481D configuration (shortend wing + removal of the winglets), to produce a short haul aircraft in 2003 at the former Boeing Military Airplanes facility (Wichita).
However the fuselage was AFAIK not fully upgraded to the real 744D's specification.
Both aircraft are already sold and converted again by Bedek, now as a 747-481BDSF(again with wing extension + winglets) before the cycle count became to high.
Aircraft involved :
1133 28282 747-481 R2716 RT756 ANA
1142 28283 747-481 R2724 RT757 ANA

L/N1142, just after modification by IAI (BEDEK) to 747-481BDSF from 744D configuration- look for the added( green primer) wing extension, incl one extra LE flap plus winglet- TLV , September 2008
Image

Note : the original 747 classic wing configuration (without wing extension + winglet) is only certified up to MTOW 833.000 lbs. This also valid for a modified 744 wing.
Operating a twin over the ocean, you're always one engine failure from a total emergency.
 
CWizard
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Re: Boeing 747-400 wing questions

Fri Jun 24, 2016 3:28 pm

Years ago I read the history of the 747 on the Boeing website and I distinctly remember it said the -400 had a completely new wing design, using (the then) latest materials, etc., and when done it weighed, including the winglet, the same as the previous wing.
 
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CCA
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Re: Boeing 747-400 wing questions

Sat Jun 25, 2016 12:37 am

-400D a 400 wing minus the extensions and winglet with only 5 variable camber leading edge flaps outboard.

-400LCF a 400 wing minus the winglet, 6 variable camber leading edge flaps outboard.

-400 GE test bed a 400 wing minus the winglet, 6 variable camber leading edge flaps outboard.
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Mumrik
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Re: Boeing 747-400 wing questions

Sun Jun 26, 2016 10:12 am

Okay, so that solves the confusion around the different 747-400 winglet and wing extension between the different types.
So, does anyone know what the dimensions and weight specifications the winglet and wing extension have on the 747-400 ?
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kraz911
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Re: Boeing 747-400 wing questions

Sun Jun 26, 2016 10:33 am

Hello all,

Regarding the winglet 0n the -400, it was six ft. in length or 1.8 meters. I forgot the weight of each. Must be getting old. Sorry...
 
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747classic
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Re: Boeing 747-400 wing questions

Sun Jun 26, 2016 12:41 pm

From the B744 Maintenance Manual:

The 747-400 Winglet is a drag reducing component which attaches to the Wing Tip Extension at two fittings with three bolts. The construction of the Winglet follows standard airfoil practices using a structure of spars and ribs enclosed by skin. The majority of the Winglet Skin is made of composite material except for the Leading Edge and Tip which uses sheet aluminum. The Winglet is faired into the Wing Tip Extension with three fairings and weighs about 146 lbs.
Operating a twin over the ocean, you're always one engine failure from a total emergency.
 
Mumrik
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Re: Boeing 747-400 wing questions

Tue Jun 28, 2016 9:31 am

kraz911 wrote:
Hello all,

Regarding the winglet 0n the -400, it was six ft. in length or 1.8 meters. I forgot the weight of each. Must be getting old. Sorry...


Thanks, do you know about the other measurements of the winglets and wing extensions?

Image
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Mumrik
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Re: Boeing 747-400 wing questions

Thu Jul 14, 2016 7:35 am

Does anyone have this information or know where I can find it?
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